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Finding the Fourth Proportional to 86,611.60, 129,917.40 and 81,362.80

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Solution

The fourth proportional to 86,611.60, 129,917.40 and 81,362.80 is: 122,044.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,611.60 : 129,917.40 = 81,362.80 : x
  2. Step 2: Convert to fraction form
    86,611.60/129,917.40 = 81,362.80/x
  3. Step 3: Cross multiply
    86,611.60x = 129,917.40 × 81,362.80
  4. Step 4: Simplify right side
    86,611.60x = 10,570,443,432.72
  5. Step 5: Solve for x
    x = 10,570,443,432.72/86,611.60
  6. Step 6: Final answer
    x = 122,044.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.